[quote=@Natsu]
Most of are characters are I think, as most are the same age.
Because I saw this in the opening post,
[i] Donning the utterly illogical uniform that served as a sign of one's magical aptitude [/i]
Does that imply all the girls that can transform wear a special uniform? If so, how does it differ?
[/quote]

I think that it's referring to a Magical Girl's transformed state, which could be said to be a status symbol of sorts in a community largely dominated by the power of Magical Girls.